package smartt.styy.auth.util;

import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.security.spec.InvalidKeySpecException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.SecretKeySpec;
import org.apache.commons.codec.binary.Base64;
 
public class TripDESUtil {
 
    private static final String KEY_ALGORITHM = "DESede";
    private static final String DEFAULT_CIPHER_ALGORITHM = "DESede/ECB/PKCS5Padding";// 默认的加密算法
 
    /**
     * DESede 加密操作
     *
     * @param content
     *            待加密内容
     * @param key
     *            加密密钥
     * @return 返回Base64转码后的加密数据
     */
    public static String encrypt(String content, String key) {
        try {
            Cipher cipher = Cipher.getInstance(DEFAULT_CIPHER_ALGORITHM);// 创建密码器
            byte[] byteContent = content.getBytes("utf-8");
            //初始化为加密模式的密码器
            //方法一
            //cipher.init(Cipher.DECRYPT_MODE, getSecretKey(key));
            //方法二
            cipher.init(Cipher.ENCRYPT_MODE, getSecretKeySpec(key));
            byte[] result = cipher.doFinal(byteContent);// 加密
            return Base64.encodeBase64String(result);// 通过Base64转码返回
        } catch (Exception ex) {
            Logger.getLogger(TripDESUtil.class.getName()).log(Level.SEVERE, null, ex);
        }
 
        return null;
    }
 
    /**
     * DESede 解密操作
     *
     * @param content
     * @param key
     * @return
     */
    public static String decrypt(String content, String key) {
 
        try {
            // 实例化
            Cipher cipher = Cipher.getInstance(DEFAULT_CIPHER_ALGORITHM);
            // 使用密钥初始化，设置为解密模式
            //方法一
            //cipher.init(Cipher.DECRYPT_MODE, getSecretKey(key));
            //方法二
            cipher.init(Cipher.DECRYPT_MODE, getSecretKeySpec(key));
            // 执行操作
            byte[] result = cipher.doFinal(Base64.decodeBase64(content));
            return new String(result, "utf-8");
        } catch (Exception ex) {
            Logger.getLogger(TripDESUtil.class.getName()).log(Level.SEVERE, null, ex);
        }
        return null;
    }
 
    /**
     * 生成加密秘钥
     *
     * @return
     */
    @SuppressWarnings("unused")
	private static SecretKey getSecretKey(final String key) {
        try {
            SecretKeySpec keySpec = new SecretKeySpec(key.getBytes(), KEY_ALGORITHM);
            SecretKey sk = SecretKeyFactory.getInstance(KEY_ALGORITHM).generateSecret(keySpec);
            return sk;
        } catch (InvalidKeySpecException e) {
            e.printStackTrace();
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
        return null;
    }
 
    /**
     * 生成加密秘钥
     *
     * @return
     */
    private static SecretKeySpec getSecretKeySpec(final String key) {
        // 返回生成指定算法密钥生成器的 KeyGenerator 对象
        KeyGenerator kg = null;
        try {
            kg = KeyGenerator.getInstance(KEY_ALGORITHM);
            // DESede
            kg.init(new SecureRandom(key.getBytes()));
            // 生成一个密钥
            SecretKey secretKey = kg.generateKey();
            return new SecretKeySpec(secretKey.getEncoded(), KEY_ALGORITHM);// 转换为DESede专用密钥
        } catch (NoSuchAlgorithmException ex) {
            Logger.getLogger(TripDESUtil.class.getName()).log(Level.SEVERE, null, ex);
        }
        return null;
    }
 
    public static void main(String[] args) {
        String content = "hello,您好";
        String key = "sde@5f98H*^hsff%dfs$r344&df8543*er";
        System.out.println("content:" + content);
        
        String s1 = TripDESUtil.encrypt(content, key);
        System.out.println("s1:" + s1);
        String result =s1+"12312";
        
        System.out.println("s2:" + TripDESUtil.decrypt(result, key));
    }
 
}